Office chair



FIG. 1 is a perspective view of an office chair showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

A bottom view thereof is omitted since it does not contain ornamental features. The heavy broken line showing of stitch lines forms portions of the claimed design, while the light broken line showing of portions of the office chair forms no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 